Vertical farming certainly seems like an awesome idea with obvious benefits, but there are clearly plausible obstacles and drawbacks that I don't know enough about agriculture to deem valid or not.
I’m thinking more on the 100 year timeline.
https://www.wolframalpha.com/input/?i=200+W%2Fm%5E2+*+area+o...
LEDs have certainly gotten more efficient and cheaper since that lecture, but I think the general argument is still the same. The sun is pretty damn powerful.
Agriculturally trained means "I know how to grow corn". Or potatoes, or maybe even 10 or 20 species of veggies in a monoculture, that must grow just for a limited amount of time before collapsing, following a set of very clear instructions and killing anything that stands in the path.
Is the equivalent as being able to copypaste a small "hello world" program on internet.